Rifle-grenade sight



P. LERA.

RIFLE GRENADE SIGHT.

APPLICATION mu) OCT. 16, 1919.

' 1,340,453, Patented May 18, 1920.

0 6 ill 0% t/pff /VENToR. BY JAJJM rcn.

RIFLE- GRENADE SIGHT.

Specification of Letters Patent.

Patented Mary 18, 1920.

Application filed. October 16, 1919. Serial No. 331,089.

To all whom it may concern:

Be it known that I, PETER LERA, a citizen of the United States, and a resident of the city and county of San Francisco, State of California, have invented new and useful Improvements in Rifle-Grenade Sight, of which the following is a specification.

My invention has for its object the accurate sighting of a rifle for grenades or the like. This 1 accomplish by an attachment adapted to clamp to the stock or barrel of the gun, having mechanism and a pair of sights adjustably fixed to the gun.

The member carrying these sights is mounted on a base piece which may be fixed to the gun, as desired, and when so fixed the sight line may be set at any predetermined angle so that the gun barrel and a firing line are adjusted, based upon a previous y determined range, resulting in the grenade, when arriving at the end of its trajectory, being placed at the point so sighted. In this way a grenade may be placed more accurately than heretofore; that is. the range can be accurately predetermined and reported to the grenade firing squad, each man may then set my sight to the correct range and windage, and then by sighting by my sights the grenade which he fires from his attached gun will fall at the point sighted.

By referring to the accompanying figures my invention will be made clear.

Figure 1 is a side view of a gun having my invention applied thereon.

Fig. 2 is an enlarged detail of my sighting apparatus to better illustrate the parts, for attachment to agun.

Fig. 3 is plan view of Fig. 2.

Fig. at is a detail of the swivel connection.

Fig. 5 is a detail section of the rear sight.

Fig. 6 is an enlarged detail of the quadrant and associated parts.

Fig. 7 is a perspective view of one of the collars for attaching the sighting device to the gun.

Fig. 8 is a perspective view .of a portion of the rear sighting device.

Fig. 9 is a front view of the graduations on the nut or screw head 9.

The grenade gun is indicated by the numeral 1, having fixed thereto the grenade discharge tube 2. To the gun is also attached my sight arm 3, having a stock or base piece 4 formed to fit the gun barrel,

.with the stock-or other portions. In the illustrations the stock piece 4; is extended on each end as at 5, 6, for clamping to the gun, as with the ring clamps 7, 8. The arm 3 is made adjustable with respect to the stock piece 4, as regards vertical angle by the quadrant 14 and as regards windage by the threaded nut 9 traveling on the screw threads 10. The screw carrying the threads 10 is provided with the head 11, fixed to the stock piece 4: and the nut 9 is turned on its outer surface at 12 to engage the arm 3. The arm 3 is held in position'against the nut 9 by the washer and the coil spring 13, which retains the arm 3 in its outermost position against the nut 9 at all times and takes up any lost motion.

The arm 9 is also engaged with the quadrant 14 by the latch, or other fixing member 15.

Mounted on the arm 3 is the fixed end sight 16 and the movable rear sight 17. The latter I prefer to arrange as a box or compartment 18 within which is delicately suspended the pendulum member 19 on the pivot 20. The box 18 is cut in its rear wall with slot 21 and in its front wall a recess 22, so that the operator on looking through the opening 22 sees exposed before him the upper, or sight end 23 of the pendulum rod 19. This is provided with the sight slot 24 normally parallel with and substantially the same size as the slot 21.

In sighting with my device, the line of sights is indicated by 25, 26 of Fig. l. The adjustable nut 9 controlling the lateral position of the arm 3, I prefer to graduate as shown in Fig. 9, as also the screw thread, as indicated at 27, so that the lateral adjustment of the arm 3 may, by the rotation of the nut 9, be set with great accuracy as regards the line of sights with the line of firing. That is, the angle between the lines 28, 29 and 25, 26.

The operation is as follows:

The grenade squad having been given the range, and having aifixed the grenade tube 2, and my sight mechanism, to their guns, first set the arm 3 by the clamp of the quadrant 14 in a position corresponding range, the quadrant 14 being. of course, suitably calibrated therefor. The nut 9 is then rotated on the thread 10 to correct any required windage which setting involves the parallelism or angularity between thesight line 25, 26, and the firing line 28, 29. (See Fig.

The arm 3 during the movement of the nut 9 turning the necessary distance about the quadrant 14: as a fulcrum, the calibration of the nut 9 and thread 10 being, of course, predetermined with regard to definite wind pressures or velocities.

The gun is now ready for sighting and firing. The stock 30 is preferably set upon the ground and with the line of sight 25, 26 directed at the point at which the grenade is to be placed, the gun is moved laterally until the pendulum 19 alines the sight 23 with the slide 21 and the terminal sight 16. The pendulum 19 insures the angularity of the plane of fire with the vertical plane through the line of sight; and the elevation of the fire line 28, 29 with respect to the sight line 25, 26 determines the trajectory and therefore the range as previously established by the quadrant 14 and the clamp 15. v

I prefer to mount the pendulum 19 on the pin 20 so as to allow of a small degree of swing in each direction, as the line of sight is not always horizontal and the pendulum 19 and sight slot 24: should at all times be vertical when in use.

It will also be apparent that an individual may find his own range by first noting on the sight calibrations a given setting and noting the divergence from the assumed contact point when and where a shot actually lands. He can actually measure on said calibrations the distance between the assumed and actual points and set up such actual differences on the calibrated scales, such differences indicating the error in the first shot. The second shot should land per fectly.

I claim:

1. Sight for grenade guns consisting of a member with means for afiixing the same in predetermined alinement with the gun;

a sight arm, and pivot means between the arm and said member; a quadrant fixed to said member and calibrated for elevation and means for clamping said quadrant interposed between the member and the arm by which the elevation may be fixed.

2. Sight for grenade guns consisting of a member. with means for aflixing the same in predetermined alinement with the gun; a sight arm, and pivot means between the arm and said member; a quadrant fixed to said member and calibrated for elevation and means for clamping said quadrant interposed between the member and the arm by which the elevation may-be fixed, said pivot means calibrated to correct for windage.

3. Sight for grenade guns consisting of a member with means for aflixing the same in predetermined alinement with the gun; a sight arm, and pivot means between the arm and said member, a quadrant fixed to said member and calibrated for elevation and means for clamping said quadrant interposed between the member and the arm by which the elevation may be fixed, and adjustable means controlling the position of the arm on the pivot.

4. Sight for grenade guns consisting of a member with means for affixing the same in predetermined alinement with the gun; a sight arm, and pivot means between the arm and said member, a quadrant fixed to said member and calibrated for elevation and means. for clamping said quadrant interposed between the member and the arm by which the elevation may be fixed, and adjustable means controlling the position of the arm on the pivot, and in combination with the pivot to correct for windage.

5. A grenade gun sight-consisting of a pivoted sight arm and a quadrant and clamp interposed between the gun and the arm by which the elevation may be fixed from the sights, a pivot on which said arm pivots j and is also laterally adjustable and about the quadrant as a fulcrum, by which a correction for the windage may be established in the line of fire.

6. A grenade gun sight consisting of apivoted sight arm and a quadrant and clamp interposed between the gun and the arm by .which the elevation may be fixed from the sights, and mounted on the arm a front and a rear sight with a pendulum member automatically alining with the sights to indicate the correct position of the gun.

7. A grenade gun sight consisting of a pivoted sight arm and a quadrant and clamp interposed between the gun and the arm by which the elevation may be fixed from the sights, a pivot on which said arm pivots and is also laterally adjustable and about the quadrant as a fulcrum, by which a correction for the windage may be established in the line of fire, and mounted on the arm a front and a rear sight with a pendulum member automatically alining with the sights to indicate the correct position of the D In testimony whereof, I have hereunto set my hand at the city of San Francisco,

California, this 9th day of October, 1919.

PETER LERA. 

